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Mats Gunnar Walday

Senior Research Scientist

Projects 2
Articles 1
Publications 99

Email address: mats.walday@niva.no
Phone number: +47 971 51 705
External profile: Cristin
Research section: Marine biology

EXPERTISE

Marine biology
Nature restoration
Sustainable coasts
Environmental Monitoring
Coastal ecosystems
Biodiversity
Nature mapping

Related content

Projects (2)

Can marine biological concrete promote marine life in offshore wind farms?

Artificial underwater structures often serve an important societal function but can have negative impacts on biodiversity by providing surfaces for colonizing benthic species that are significantly different from those found in natural habitats. The main objective of this project is to conduct a pilot study to test the potential of different materials for the re-establishment of marine life. We have chosen to focus on the quality of concrete (pH and porosity) in this project.

Project period: 2024 - 2025

Co-existence and nature positive approaches for offshore wind power development

Summarizing knowledge on co-existence and nature-positive approaches in the offshore wind industry.

Project period: 2022 - 2023

Publications (99)

Utslepp av kjølevatn til Idsefjorden frå planlagt datasenter på Jørpeland. Konsekvensvurdering for marint miljø

Lars Gunder Golmen, Mats Gunnar Walday, Anfisa Berezina, Pipatthra Saesin

Spread of invasive species via biofouling of marine vessels: A brief assessment

Stefani Piarulli, Oliver Floerl, Mats Gunnar Walday, Adam Jon Andrews, Samantha Eslava Martins, Nina Bloecher

Langsiktig forskning og modige tiltak må til om vi skal redde Oslofjorden. Debattinnlegg i Khrono, 14.08.2023. khrono.no/langsiktig-forskning-og-modige-tiltak-ma-til-om-vi-skal-redde-oslofjorden/800689

Nils Christian Stenseth, Sissel Jentoft, Even Moland, Halvor Knutsen, Thrond Oddvar Haugen, JE Colman

Reader opinion piece

2023 | Khrono.no

Mariussen MS, Strøm V, Valseth ÅA, Vennemo K, Bjorbækmo MFM, Chen W, Furuseth IS, Bekkby T, Berg PR, Saesin P, Staalstrøm A, Walday MG, Kaste Ø, Ruus A, Hess-Erga O-K, Langaas S. Mulighetskartlegging for kystbaserte næringer i Viken – Indre Oslofjord og Drammensfjorden. Vista Analyse Report 2023/11. ISBN 978-82-8126-623-0. https://www.vista-analyse.no/site/assets/files/7886/va-rapport_2023- 11_mulighetskartlegging_for_kystbaserte_naeringer_i_viken.pdf

MS Mariussen, V Strøm, ÅA Valseth, K Vennemo, Marit Bjorbækmo, Wenting Chen

A synthesis review of nature positive approaches and coexistence in the offshore wind industry

Juan Carlos Farias Pardo, Magnus Aune, Christopher Harman, Mats Walday, Solrun Figenschau Skjellum

Academic article

2023 | ICES Journal of Marine Science

Tilstandsklassifisering av makroalger i sjøsonen. Revidering av komboindeksen.

Camilla With Fagerli, Mats Walday, Janne Gitmark

Forbedring av oksygenforhold ved kunstig omrøring i Oslofjorden

Andre Staalstrøm, Mats Walday, Evgeniy Yakushev, Svetlana Pakhomova, Anfisa Berezina, Lars Golmen

Revisjon av kystvannsdelen av veileder 02:2018

Mats Gunnar Walday, Gunhild Borgersen, Janne Kim Gitmark, Anette Engesmo, Camilla With Fagerli, Andre Staalstrøm

Kartlegging av sjøarealer i Moss

Gunhild Borgersen, Janne Kim Gitmark, Kristina Øie Kvile, Hilde Cecilie Trannum, Mats Gunnar Walday, Lars Dalen

Hanging gardens - do floating kelp farm communities resemble natural kelp forests?

Trine Bekkby, Ragnhild Ryther Grimm Torstensen, Lars Andreas Holm Grünfeld, Hege Gundersen, Stein Fredriksen, Eli Rinde

Academic lecture

Fornebu Brygge. Konsekvensutredning – natur i sjø

Mats Gunnar Walday, Camilla With Fagerli

Overvåking av Ytre Oslofjord 2019-2023 - Årsrapport 2021

Mats Gunnar Walday, Anette Engesmo, Camilla With Fagerli, Janne Kim Gitmark, Sandra Gran-Stadniczeñko, Øyvind Kaste

‘Hanging gardens’—comparing fauna communities in kelp farms and wild kelp forests

Trine Bekkby, Ragnhild Ryther Grimm Torstensen, Lars Andreas Holm Grünfeld, Hege Gundersen, Stein Fredriksen, Eli Rinde

Academic article

2023 | Frontiers in Marine Science

Bruk av droner for kartlegging av marin vegetasjon i Indre Oslofjord.

Mats Gunnar Walday

Academic lecture

Sluttrapport fra Frisk Oslofjord

Bjørn Strandli, Frithjof Emil Moy, Tone Kroglund, Arne Johan Hestnes, Geir Endregard, Mats Gunnar Walday

Utvikling av kartleggingsmetodikk og kriterier for lokalitetskvalitet for marine naturtyper.

Eli Rinde, Siri Røang Moy, Gunhild Borgersen, Marijana Stenrud Brkljacic, Camilla With Fagerli, Janne Kim Gitmark

Hanging gardens - do floating kelp farm communities resemble natural kelp forests?

Trine Bekkby, Ragnhild Ryther Grimm Torstensen, Lars Andreas Holm Grünfeld, Hege Gundersen, Stein Fredriksen, Eli Rinde

Academic lecture

Undersøkelse av hydrografiske og biologiske forhold i Indre Oslofjord Årsrapport 2021

Andre Staalstrøm, Guri Sogn Andersen, Mats Gunnar Walday, Anette Engesmo, Sandra Gran-Stadniczeñko, E. Therese Harvey

Eutrofiovervåking i Ytre Oslofjord 2019-2023. Bentosundersøkelser i 2021. Fagrapport

Janne Kim Gitmark, Camilla With Fagerli, Mats Gunnar Walday

Klassifiseringsveileder 02:2018 - Revisjonsbehov kystvann

Mats Gunnar Walday, Janne Kim Gitmark, Anette Engesmo, Andre Staalstrøm, Hege Gundersen, Gunhild Borgersen

Evaluering av komboindeksens egnethet for tilstandsklassifisering av makroalger i sjøsonen

Camilla With Fagerli, Janne Kim Gitmark, Hege Gundersen, Maia Røst Kile, Siri Røang Moy, Mats Gunnar Walday

Feltbasert kunnskap, metodikk og kriterier for økologisk kvalitet til et utvalg av marine naturtyper

Eli Rinde, Siri Røang Moy, Lise Ann Tveiten, Kristina Øie Kvile, Mats Gunnar Walday, Hartvig C Christie

Utredning av behovet for å redusere tilførslene av nitrogen til Ytre Oslofjord

Andre Staalstrøm, Mats Gunnar Walday, Christian Vogelsang, Helene Frigstad, Gunhild Borgersen, Jon Albretsen

Bruk av droner i forskning

Mats Gunnar Walday, Kasper Hancke, Eduardo Infantes

Academic lecture

Hvordan kan vi bruke naturregnskap som grunnlag for forvaltning og restaurering?

Wenting Chen, David Nicholas Barton, Mats Gunnar Walday, Hartvig C Christie, Trine Bekkby, Hege Gundersen

Overvåking av Ytre Oslofjord 2019-2023 - Årsrapport 2020

Anette Engesmo, Andre Staalstrøm, Sandra Gran-Stadniczeñko, Gunhild Borgersen, Bjørnar Beylich, Øyvind Kaste

Background Document for Kelp Forests habitat

Thibaut de Bettignies, Florian de Bettignies, Inka Bartsch, Trine Bekkby, A Boiffin, P Casado de Amezúa

Frisk Oslofjord. Undersøkelser på grunt vann - med utprøving av ny teknologi

Mats Gunnar Walday, Eli Rinde, Guri Sogn Andersen, Kasper Hancke, Siri Røang Moy

Overvåking av Ytre Oslofjord 2019-2023. Bunnundersøkelser i 2020. Fagrapport

Bjørnar Beylich, Gunhild Borgersen, Mats Gunnar Walday

Bispevika. Vurdering av vannutskiftning og miljøforhold i vannbasseng B6b

Mats Gunnar Walday, Jarle Molvær, Eli Rinde, Elin Tanding Sørensen, Hartvig C Christie, Øyvind Leikvin

Evaluation of ØKOKYST – station network and class boundaries

Mats Gunnar Walday, Camilla With Fagerli, Helene Frigstad, Andre Staalstrøm, Maria Kaurin, Guttorm Christensen

Urban underwater landscape and tidal gardens – is it possible to transform seafloor deserts in Oslo Harbour to underwater oasis?

Elin Tanding Sørensen, Eli Rinde, Hartvig C Christie, Mats Gunnar Walday, Fagerli Camilla W., Anne Beate Hovind

Restoration of biological diversity of Oslo's urban sea areas

Eli Rinde, Elin Tanding Sørensen, Mats Gunnar Walday, Camilla With Fagerli, Hartvig C Christie, Andre Staalstrøm

Monitoring of the outer Oslofjord 2014-2018

Mats Gunnar Walday, Gunhild Borgersen, Bjørnar Beylich, Wenche Eikrem, Janne Kim Gitmark, Lars Johan Naustvoll

Monitoring of the outer Oslo fjord - inputs and surveys in the watermasses in 2018. Technical report

Lars Johan Naustvoll, John Rune Selvik, Mats Gunnar Walday

Monitoring of the Outer Oslofjord 2014-2018. Bottom surveys in 2018. Technical report

Bjørnar Beylich, Gunhild Borgersen, Mats Gunnar Walday

Action-oriented monitoring of environmental status in Tista and Iddefjorden in 2018 in relation to emissions from Norske Skog Saugbrugs AS.

Gunhild Borgersen, Marijana Stenrud Brkljacic, Maia Røst Kile, Mats Gunnar Walday

Technical report - Norwegian assessment method for Angiosperms in NEA7, NEA8a, NEA9, NEA10, where the Intercalibration exercise is not possible (Gap 3)

Mats Gunnar Walday, Norman Whitaker Green, Hege Gundersen

Eksempelsamling for tiltaksorientert overvåking

Sissel Brit Ranneklev, Sigrid Haande, Mats Gunnar Walday, Merete Grung

Impact assessment for the marine environment of installation of sea cable on the route Sandvika - Varpet in Rognsfjorden (Norway)

Mats Gunnar Walday, Morten Schaanning

Tare i tiden

Hege Gundersen, Guri Sogn Andersen, Trine Bekkby, Hartvig C Christie, Camilla With Fagerli, Karen Filbee-Dexter

Popular scientific lecture

The Combo Index – for monitoring eutrophication related problems of macroalgae in the sublittoral zone

Hege Gundersen, Janne Kim Gitmark, Mats Gunnar Walday

Academic lecture

Overvåking av Ytre Oslofjord 2014-2018. Årsrapport for 2017

Mats Gunnar Walday, Janne Kim Gitmark, Lars Johan Naustvoll, John Rune Selvik

Overvåking av Ytre Oslofjord 2014-2018. Tilførsler og undersøkelser i vannmassene i 2017. Fagrapport

Lars Johan Naustvoll, Marit Norli, John Rune Selvik, Mats Gunnar Walday

Overvåking av Ytre Oslofjord 2014-2018. Bentosundersøkelser i 2017. Fagrapport

Janne Kim Gitmark, Mats Gunnar Walday

Marine Monitoring Nordland 2016-2017

Gunhild Borgersen, Anna Birgitta Ledang, Marit Norli, Thor Arne Hangstad, Mats Gunnar Walday

Nye klassegrenser for ålegress og makroalger i vannforskriften

Hege Gundersen, Mats Gunnar Walday, Janne Kim Gitmark, Trine Bekkby, Eli Rinde, Tron Hansen Syverud

Monitoring of the outer Oslofjord. Investigations in 2016.

Mats Gunnar Walday, Janne Kim Gitmark, Lars Johan Naustvoll, John Rune Selvik

Monitoring of the outer Oslo fjord - inputs and surveys in the watermasses in 2015. Technical report

LJ Naustvoll, Marit Norli, John Rune Selvik, Mats Gunnar Walday

Monitoring of the Outer Oslofjord 2014-2018. Benthos Surveys in 2016. Technical report

Janne Kim Gitmark, Camilla With Fagerli, Mats Gunnar Walday

Ny forskrift setter vitenskapelige dykkere på land

David Berg Tuddenham, Even Moland, Marek Cuhra, Mats Gunnar Walday, Haakon Hop, Eirik Søyland Laskemoen Herdlevær

Feature article

2017 | Forskning.no

Eutrophication status for Norwegian waters. National report for the third application of OSPARs Common Procedure

Kjell Magnus Norderhaug, Hege Gundersen, Tore Høgåsen, Torbjørn Martin Johnsen, Gunnar Severinsen, Jens Vedal

Ecosystem Services in the Coastal Zone of the Nordic Countries

Hege Gundersen, Tanya Bryan, Wenting Chen, Frithjof Emil Moy, Antonia Sandman, Göran Sundblad

Articles (1)

We need a better definition of nature positivity

Nature positivity is a popular buzz word for those engaged in the offshore wind industry. But a recent study concludes that a scientific definition of what it really means, is missing.

Published: 05.01.2024

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